A new type of damping explosion-proof valve

Abstract

This invention discloses a novel damping explosion-proof valve, comprising: a valve body having several pressure relief holes and movable holes; a top cover having a guide rod at its lower part, the guide rod passing through the movable holes, and a venting channel forming between the guide rod and the movable holes; a spring disposed between the guide rod and the valve body, the top cover abutting against the valve body under the elastic force of the spring, and forming a sealed assembly through an inner sealing ring; and a sleeve fixedly fitted onto the lower end of the valve body and covering the lower part of the spring and guide rod; the sleeve having an air inlet and a one-way sealing assembly; when the top cover is pressed open outward, the one-way sealing assembly is also pressed open simultaneously, allowing the air inlet to be open; when the top cover is opened to its limit position or the top cover and guide rod are reset by the spring force to fall back, the one-way sealing assembly resets to seal the air inlet, and the guide rod continuously compresses the gas in the sleeve during the fall process, thereby forming damping to slow down the fall speed of the guide rod or temporarily stopping the fall of the guide rod, so that the explosion-proof valve can discharge more gas.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof valve technology, and specifically to a novel damping explosion-proof valve. Background Technology

[0002] The battery pack, electronic control system, and motor of an electric vehicle are the core components of a new energy electric vehicle, and their safety and reliability are of paramount importance. To ensure their safe and stable operation, they need to be waterproof and dustproof, that is, theoretically, completely sealed. However, in a completely sealed state, if an internal short circuit, battery overcharging or over-discharging, or other abnormal thermal runaway occurs, a large amount of high-temperature, high-pressure gas will be generated and accumulated. At the same time, a large amount of solid-gas mixture containing solid or gelatinous substances will also be generated. If it cannot be discharged in time, it will usually cause violent fire, combustion, and explosion, resulting in significant casualties and property damage.

[0003] Therefore, the current approach is to install one or more explosion-proof valves on power system components such as battery packs to waterproof and prevent explosions, thereby preventing or reducing casualties and property losses caused by sudden abnormal accidents such as deflagration and rupture inside the battery pack.

[0004] The utility model patent with application number CN223347947U discloses a waterproof, breathable, and explosion-proof valve that increases exhaust volume. It includes a valve body, a piston, a spring, and a guide rod. The piston is fixedly connected to the guide rod, which passes through the valve body. The spring is sleeved around the guide rod and abuts against the lower end of the valve body. Under the action of the spring force, the piston abuts against and covers the exhaust channel of the valve body. The valve body has a guide ring in the middle, and the guide ring has a sliding hole through which the rod of the guide rod or piston passes. There are at most two internal thin connecting ribs between the outer periphery of the guide ring and the valve body, so that there are at most two exhaust channels between the outer periphery of the guide ring and the valve body.

[0005] The aforementioned waterproof, breathable, and explosion-proof valve has the following shortcomings: When the pressure is too high, the spring is compressed and the piston is pushed outward to open relative to the valve body, which can achieve pressure relief. As the pressure is relieved, the spring force gradually decreases, and the spring will immediately return to its original position. That is, the spring force will immediately drive the piston to reset. This means that the time the piston is in the open state cannot be extended, so that more gas cannot be discharged. Ultimately, this will affect the pressure relief and explosion-proof effect, and will also cause the pressure inside the battery pack to remain relatively high, which also poses certain safety hazards.

[0006] In view of the above, the inventors propose the following technical solution. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a new type of damping explosion-proof valve.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The novel damping explosion-proof valve includes: a valve body, which is provided with several pressure relief holes and movable holes; a top cover, the lower part of which is provided with a guide rod, the guide rod passing through the movable hole, the top cover being able to move up and down relative to the valve body through the guide rod, and a venting channel being formed between the guide rod and the movable hole; a spring, which is provided between the guide rod and the valve body, and the top cover abuts against the valve body under the elastic force of the spring, and a sealing assembly is formed by an inner sealing ring; a sleeve, which is fixedly sleeved on the lower end of the valve body and The cover covers the lower part of the spring and guide rod; the sleeve is provided with an air inlet and a one-way sealing component for sealing or opening the air inlet; when the upper cover is pressed open outward, the one-way sealing component is also pressed open at the same time, so that the air inlet is open; when the upper cover is opened to the limit position or the upper cover and guide rod are reset by the spring force to fall back, the one-way sealing component resets to seal the air inlet, and the guide rod will continuously compress the gas in the sleeve during the fall process to form damping to slow down the fall speed of the guide rod or temporarily stop the fall of the guide rod, so that the explosion-proof valve can discharge more gas.

[0009] Furthermore, in the above technical solution, the inner wall of the movable hole is provided with a fine air guide groove, and an air passage is formed between the outer wall of the guide rod and the fine air guide groove, and the air passage is connected downward to the inner cavity of the sleeve.

[0010] Furthermore, in the above technical solution, the air guide grooves are distributed along the axial direction, and the guide rod's descent speed is controlled by controlling the number and / or size and / or area of ​​the air guide grooves.

[0011] Furthermore, in the above technical solution, the gap between the inner wall of the movable hole and the outer wall of the guide rod forms the air-permeable channel.

[0012] Furthermore, in the above technical solution, the air inlet is located at the lower end of the sleeve and below the lower end face of the guide rod.

[0013] Furthermore, in the above technical solution, the guide rod is cylindrical and has a through hole extending through the upper and lower ends. The upper inner wall of the through hole is provided with an internal thread. The lower end of the upper cover is formed with a threaded section, which is screwed and fixedly assembled with the internal thread through the threaded section. The lower end of the guide rod is formed with an outwardly extending flange, which contacts the lower end of the spring. Alternatively, the guide rod is integrally connected to the lower end of the upper cover to form an inseparable part, and the lower end of the guide rod is formed with an outwardly extending flange, which contacts the lower end of the spring.

[0014] Furthermore, in the above technical solution, a boss is formed at the lower end of the valve body, and the upper end of the sleeve is fitted and fixed to the outside of the boss to form a sealing assembly.

[0015] Furthermore, in the above technical solution, a first annular groove is provided on the outer side of the boss, and a first sealing ring is also provided in the first annular groove. The inner wall of the upper end of the sleeve contacts the first sealing ring to form a tight sealing assembly.

[0016] Furthermore, in the above technical solution, the one-way sealing assembly includes a fixing member disposed inside the sleeve, a sealing gasket sleeved on the fixing member and movable up and down relative to the fixing member, and a small spring disposed between the fixing member and the sealing gasket. The sealing gasket presses against all air inlets under the elastic force of the small spring to seal the air inlets.

[0017] Furthermore, in the above technical solution, the one-way sealing assembly includes an umbrella-shaped sealing gasket and a connecting buckle integrally formed on the lower end of the umbrella-shaped sealing gasket; the sleeve is provided with a connecting hole on the side of the air inlet, the connecting buckle is snapped and fixed in the connecting hole, and the outer edge of the umbrella-shaped sealing gasket covers the outside of all air inlets from top to bottom to achieve sealing of the air inlets.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: When the battery pack experiences thermal runaway, a large amount of high-pressure gas is rapidly generated inside the pack. At this time, the top cover is quickly pushed up, and the guide rod moves upward with the top cover, thereby achieving the pressure relief and explosion-proof function. At this time, a negative pressure is generated in the inner cavity of the sleeve, and the high-pressure gas outside the sleeve will act on the one-way sealing component through the air inlet to open the one-way sealing component. That is, the one-way sealing component is opened under pressure, making the air inlet open, and the high-pressure gas enters the inner cavity of the sleeve to achieve compensation, thereby making the top cover open more smoothly outward; when the top cover is pushed open to At its limit, it will not rise further. At this point, the air pressure inside the sleeve cavity is balanced, and the one-way sealing component naturally resets. As the air pressure inside the exhaust continues to decrease, after the pressure relief is completed, the guide rod will receive the spring restoring force and fall downwards. During the fall, the guide rod compresses the gas inside the sleeve cavity, causing the air pressure inside the sleeve cavity to continuously rise, thus forming a damping force acting on the lower end of the guide rod. The speed at which the guide rod falls will be significantly slower or even stop briefly. The purpose of this is to allow the entire damping explosion-proof valve to discharge more gas during the slow fall time, thereby enhancing / increasing the exhaust effect of the entire explosion-proof valve. Attached Figure Description

[0019] Figure 1 This is a perspective view of Embodiment 1 of the present invention.

[0020] Figure 2 This is a perspective view of another embodiment of the present invention.

[0021] Figure 3 This is an exploded perspective view of Embodiment 1 of the present invention.

[0022] Figure 4 This is a cross-sectional view of the initial state of Embodiment 1 of the present invention.

[0023] Figure 5 This is a cross-sectional view of the depressurization state in Embodiment 1 of the present invention.

[0024] Figure 6 This is a perspective view of the one-way sealing assembly in Embodiment 1 of the present invention.

[0025] Figure 7 This is a perspective view of the valve body in Embodiment 1 of the present invention.

[0026] Figure 8 This is a perspective view of Embodiment 2 of the present invention.

[0027] Figure 9 This is a cross-sectional view of the initial state of Embodiment 2 of the present invention.

[0028] Figure 10 This is a perspective view of the valve body in Embodiment 2 of the present invention.

[0029] Figure 11 This is a perspective view of the one-way sealing assembly in Embodiment 2 of the present invention.

[0030] Figure 12 This is a perspective view of the sleeve in Embodiment 2 of the present invention. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0032] Example 1:

[0033] See Figure 1-7 The image shows a novel damping explosion-proof valve, comprising: a valve body 1, a top cover 2, a guide rod 3, a spring 4, and a sleeve 5, which is the structure of a conventional explosion-proof valve. This invention is primarily used in battery packs to prevent battery pack explosions.

[0034] The valve body 1 is provided with several pressure relief holes 11 and movable holes 12.

[0035] The upper cover 2 is provided with a guide rod 3 at its lower part. The guide rod 3 passes through the movable hole 12. The upper cover 2 can move up and down relative to the valve body 1 through the guide rod 3, and a venting channel is formed between the guide rod 3 and the movable hole 12. The spring 4 is provided between the guide rod 3 and the valve body 1. The upper cover 2 abuts against the valve body 1 under the elastic force of the spring 4 and forms a sealed assembly through the inner sealing ring 10. The inner sealing ring 10 is installed in the annular groove at the upper end of the valve body 1. The sleeve 5 is fixedly sleeved on the lower end of the valve body 1 and covers the lower part of the spring 4 and the guide rod 3. It can protect the inner spring from being adhered to by the ejected material from the battery cell inside the battery pack. When the explosion is prevented, the upper cover can be opened smoothly, thereby forming a smooth pressure relief and achieving the explosion-proof effect.

[0036] Under normal conditions (i.e., pressure balance), the spring 4 is compressed, thus exerting a downward pulling force on the top cover 2. The top cover 2, under the elastic force of the spring 4, abuts against the valve body 1, forming a sealed assembly through the inner sealing ring to ensure a tight seal. When the battery pack experiences thermal runaway, a large amount of high-pressure gas is rapidly generated inside the pack. This high-pressure gas acts on the inside of the top cover through the pressure relief hole 11, overcoming the elastic force of the spring 4 and further compressing it, causing the top cover 2 to open outwards. The top cover 2 is quickly pushed up, and the guide rod 3 moves upwards with it. At this time, a pressure relief channel is formed between the top cover 2 and the valve body 1, connecting the pressure relief hole 11 to the outside. The high-pressure gas inside the pack is then released to the outside through the pressure relief hole 11 and the pressure relief channel, achieving the effect of venting and depressurizing. After depressurization, there is no sufficient pressure to open the top cover 2, and the top cover 2 quickly returns to its original position under the elastic force of the spring 4, achieving the purpose of reuse and renewed protection. However, this has the following problems: because the top cover 2 and guide rod 3 reset and fall back quickly, they cannot expel more gas from the battery pack, which affects the pressure relief and explosion prevention effect. As a result, after the top cover 2 and guide rod 3 are reset, the pressure inside the battery pack is still relatively high, which also poses certain safety hazards.

[0037] To this end, the present invention has made the following improvements: the sleeve 5 is provided with an air inlet 51 and a one-way sealing component 6 for sealing or opening the air inlet 51; when the upper cover 2 is pressed open outward, the one-way sealing component 6 is also pressed open at the same time, so that the air inlet 51 is open; when the upper cover is opened to the limit position or the upper cover 2 and the guide rod 3 are reset by the spring force of the spring 4 to fall back, the one-way sealing component 6 is reset to seal the air inlet 51, and the guide rod 3 will continuously compress the gas in the sleeve 5 during the fall process to form damping to slow down the fall speed of the guide rod 3 or briefly stop the fall of the guide rod 3, so that the explosion-proof valve can discharge more gas. In other words, when the battery pack experiences thermal runaway, a large amount of high-pressure gas is rapidly generated inside the pack. At this time, the top cover 2 is quickly pushed up, and the guide rod 3 moves upward with the top cover 2, thereby achieving the pressure relief and explosion-proof function. At this time, a negative pressure is generated in the inner cavity of the sleeve 5 (similar to a syringe being pulled open). The high-pressure gas outside the sleeve 5 will act on the one-way sealing component 6 through the air inlet 51 to open the one-way sealing component 6. That is, the one-way sealing component 6 is opened under pressure, making the air inlet 51 open, and the high-pressure gas enters the inner cavity of the sleeve 5 to achieve compensation, thereby making the top cover 2 open outward (i.e., the explosion-proof process) more smoothly. When the top cover 2 is pushed open to its limit, it will not rise any further (i.e., it is restricted by the guide rod 3). At this time, the When the air pressure inside the sleeve 5 is balanced, the one-way sealing component 6 naturally resets. As the air pressure inside the exhaust chamber continues to decrease, after the pressure relief is completed, the guide rod will fall downwards due to the restoring force of the spring. During the fall, the guide rod 3 compresses the gas inside the sleeve 5, causing the air pressure inside the sleeve 5 to continuously increase, thus forming a damping force acting on the lower end of the guide rod 3. The speed at which the guide rod 3 falls will be significantly slower or even stop briefly (just like blocking the mouth of a syringe and being unable to push the syringe handle back). The purpose of this is that during the slow fall time, the entire damping explosion-proof valve can discharge more gas (because it no longer needs to overcome the downward elastic force of the spring 4), thereby strengthening / increasing the exhaust effect of the entire explosion-proof valve.

[0038] When the guide rod 3 compresses the gas inside the sleeve 5 during its descent, a very small amount of air pressure can be discharged through the ventilation channel formed between the guide rod 3 and the movable hole 12, so that the guide rod 3 can fall back.

[0039] The formation of the air-permeable channel includes at least the following two methods:

[0040] The first method is as follows: the inner wall of the movable hole 12 is provided with a fine air guide groove 121, and an air passage is formed between the outer wall of the guide rod 3 and the fine air guide groove 121, and the air passage is connected downward to the inner cavity of the sleeve 5.

[0041] The outer wall of the guide rod 3 contacts the inner wall of the movable hole 12, and the gap between them is extremely small, resulting in a more stable installation structure and more stable sliding of the guide rod 3 relative to the movable hole 12, without any shaking. The air guide grooves 121 are distributed along the axial direction, and the falling speed of the guide rod 3 can be controlled by controlling the number and / or size and / or area of ​​the air guide grooves 121.

[0042] To control the guide rod 3 to fall back faster, more air guide channels 121 can be arranged or the area or size of the air guide channels 121 can be reduced, so that other parts of the sleeve 5 cavity can be discharged more quickly. The resulting air pressure will be relatively small, that is, the damping effect will be smaller. To control the guide rod 3 to fall back slower, more air guide channels 121 can be arranged or the area or size of the air guide channels 121 can be increased, so that other parts of the sleeve 5 cavity can be discharged more slowly. The resulting air pressure will be relatively large, that is, the damping effect will be greater.

[0043] The second method is: the gap between the inner wall of the movable hole 12 and the outer wall of the guide rod 3 forms the air passage.

[0044] This embodiment is a preferred embodiment and adopts the first method described above.

[0045] The structure between the guide rod 3 and the upper cover 2 is as follows: the guide rod 3 is cylindrical and has a through hole 31 extending through both the upper and lower ends. The upper inner wall of the through hole 31 is provided with an internal thread. The lower end of the upper cover 2 is formed with a threaded section 21, which is screwed and fixedly assembled with the internal thread through the threaded section 21. The lower end of the guide rod 3 is formed with an outwardly extending flange 32, which contacts the lower end of the spring 4. Since the guide rod 3 is cylindrical, that is, the guide rod 3 has an inner cavity, a larger air space is formed inside the sleeve 5, so that the guide rod 3 compresses more gas when it falls back, thereby better controlling the falling speed of the guide rod 3. This is the preferred solution in this embodiment. Alternatively, the guide rod 3 is integrally connected to the lower end of the upper cover 2, forming an inseparable part, and the lower end of the guide rod 3 is formed with an outwardly extending flange 32, which contacts the lower end of the spring 4.

[0046] The assembly structure of the sleeve 5 and the valve body 1 is as follows: a boss 13 is formed at the lower end of the valve body 1, and the upper end of the sleeve 5 is fitted and fixed to the outside of the boss 13 to form a sealed assembly. The assembly structure is simple and easy to install.

[0047] To improve assembly sealing and prevent air leakage between sleeve 5 and valve body 1 when the guide rod 3 compresses gas during its subsequent retraction, the following design was implemented: (Referencing...) Figure 9As shown, a first annular groove 131 is provided on the outer side of the boss 13, and a first sealing ring 132 is also provided in the first annular groove 131. The inner wall of the upper end of the sleeve 5 contacts the first sealing ring 132 to form a tight sealing assembly.

[0048] The air inlet 51 is located at the lower end of the sleeve 5 and below the lower end face of the guide rod 3.

[0049] In this embodiment, the one-way sealing assembly 6 includes a fixing member 61 disposed inside the sleeve 5, a sealing gasket 62 sleeved on the fixing member 61 and movable up and down relative to the fixing member 61, and a small spring 63 disposed between the fixing member 61 and the sealing gasket 62. The sealing gasket 62 presses against all the air inlets 51 under the elastic force of the small spring 63 to seal the air inlets 51. This is the initial state. When the explosion-proof valve is in the stage of starting to depressurize, that is, when a large amount of high-pressure gas is formed in the battery pack and pushes the top cover open, the high-pressure gas will also act on the lower end of the sealing gasket 62 through the air inlet 51, thereby overcoming the elastic force of the small spring 63 to push the sealing gasket 62 upward, so that the air inlet 51 is in the open / conducting state. At this time, the high-pressure gas enters the inner cavity of the sleeve 5 to achieve compensation, thereby making the top cover 2 open outward (i.e., the explosion-proof process) more smoothly.

[0050] To better install the one-way sealing component 6 on the sleeve 5, the wall thickness of the lower transverse portion of the sleeve 5 is directly increased, and a mounting hole 50 is opened in the thickened portion at the lower end of the sleeve 5. The lower end of the fastener 61 is fixed in the mounting hole 50, and the air inlet 51 is located beside the mounting hole 50, thereby enhancing the stability of the assembly structure.

[0051] The mounting hole 50 is a screw hole, and the lower end of the fastener 61 has a threaded portion that screws into the screw hole for easier installation. The upper end of the fastener 61 has a tool slot for use with flathead, Phillips, or Torx screwdrivers, allowing for better control during installation and removal. Alternatively, the lower end of the fastener 61 can be a column that fits into the mounting hole 50 and is secured with an interference fit.

[0052] In summary, during thermal runaway of the battery pack, a large amount of high-pressure gas is rapidly generated inside the pack. At this time, the top cover 2 is quickly pushed up, and the guide rod 3 moves upward with the top cover 2, thereby achieving the pressure relief and explosion-proof function. At this time, a negative pressure is generated in the inner cavity of the sleeve 5 (similar to a syringe being pulled open). The high-pressure gas outside the sleeve 5 will act on the one-way sealing component 6 through the air inlet 51 to open the one-way sealing component 6. That is, the one-way sealing component 6 is opened under pressure, making the air inlet 51 open, and the high-pressure gas enters the inner cavity of the sleeve 5 to achieve compensation, thereby making the top cover 2 open outward (i.e., the explosion-proof process) more smoothly. When the top cover 2 is pushed open to the limit, it will not rise further (i.e., it is restricted by the guide rod 3). At this time, the... When the air pressure inside the sleeve 5 is balanced, the one-way sealing component 6 naturally resets. As the air pressure inside the exhaust chamber continues to decrease, after the pressure relief is completed, the guide rod will fall downwards due to the restoring force of the spring. During the fall, the guide rod 3 compresses the gas inside the sleeve 5, causing the air pressure inside the sleeve 5 to continuously increase, thus forming a damping force acting on the lower end of the guide rod 3. The speed at which the guide rod 3 falls will be significantly slower or even stop briefly (just like blocking the mouth of a syringe and being unable to push the syringe handle back). The purpose of this is that during the slow fall time, the entire damping explosion-proof valve can discharge more gas (because it no longer needs to overcome the downward elastic force of the spring 4), thereby strengthening / increasing the exhaust effect of the entire explosion-proof valve.

[0053] Example 2:

[0054] As shown in Figures 8-12, the difference between this second embodiment and the first embodiment is that the one-way sealing assembly 6 includes an umbrella-shaped sealing gasket 64 and a connecting buckle 65 integrally formed on the lower end of the umbrella-shaped sealing gasket 64; the sleeve 5 is provided with a connecting hole 52 on the side of the air inlet 51, and the connecting buckle 65 is snapped and fixed in the connecting hole 52. The outer edge of the umbrella-shaped sealing gasket 64 covers the outside of all air inlets 51 from top to bottom to seal the air inlets 51. This is the initial state. When the explosion-proof valve is in the stage of starting to depressurize, that is, when a large amount of high-pressure gas is formed in the battery pack and pushes the top cover open, the high-pressure gas will also act on the lower end of the umbrella-shaped sealing gasket 64 through the air inlet 51, thereby driving the outer edge of the umbrella-shaped sealing gasket 64 to fold upward, so that the air inlet 51 is in the open / conducting state. At this time, the high-pressure gas enters the inner cavity of the sleeve 5 to achieve compensation, thereby making the top cover 2 open outward (i.e., the explosion-proof process) more smoothly.

[0055] To better install the one-way sealing assembly 6 on the sleeve 5, the wall thickness of the lower transverse portion of the sleeve 5 is directly increased. A connecting hole 52 is formed in the thickened portion at the lower end of the sleeve 5, and the connecting buckle 65 is snapped into and fixed with the connecting hole 52. In this embodiment, combined with Figure 12 As shown, the connecting hole 52 is located between all the air inlets 51 and communicates with the air inlets 51, so that a smaller umbrella-shaped sealing gasket 64 can also cover all the air inlets 51.

[0056] To improve assembly sealing and prevent air leakage between the sleeve 5 and valve body 1 when the guide rod 3 compresses gas during its subsequent retraction, the following design was implemented: [Further details omitted] Figure 9 As shown, a first annular groove 131 is provided on the outer side of the boss 13, and a first sealing ring 132 is also provided in the first annular groove 131. The inner wall of the upper end of the sleeve 5 contacts the first sealing ring 132 to form a tight sealing assembly.

[0057] Apart from the differences mentioned above, the other structures of this embodiment two are the same as those of the other structures of the above embodiment one, and can achieve the same technical effect, so they will not be described again.

[0058] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A novel damping explosion-proof valve, comprising: The valve body (1) is provided with several pressure relief holes (11) and movable holes (12). The upper cover (2) has a guide rod (3) at its lower part. The guide rod (3) passes through the movable hole (12). The upper cover (2) can move up and down relative to the valve body (1) through the guide rod (3), and a breathable channel is formed between the guide rod (3) and the movable hole (12). A spring (4) is located between the guide rod (3) and the valve body (1), and the upper cover (2) abuts against the valve body (1) under the elastic force of the spring (4), and forms a sealed assembly through the inner sealing ring (10); The sleeve (5) is fixedly sleeved on the lower end of the valve body (1) and covers the lower part of the spring (4) and the guide rod (3); The sleeve (5) is characterized by having an air inlet (51) and a one-way sealing assembly (6) for sealing or opening the air inlet (51); when the upper cover (2) is pressed open outward, the one-way sealing assembly (6) is also pressed open at the same time, so that the air inlet (51) is open; when the upper cover is opened to the limit position or the upper cover (2) and the guide rod (3) are reset by the spring force of the spring (4) to fall back, the one-way sealing assembly (6) is reset to seal the air inlet (51), and the guide rod (3) will continuously compress the gas in the sleeve (5) during the fall process to form damping to slow down the fall speed of the guide rod (3) or briefly stop the fall of the guide rod (3), so that the explosion-proof valve discharges more gas.

2. The novel damping explosion-proof valve according to claim 1, characterized in that: The inner wall of the movable hole (12) is provided with a fine air guide groove (121). An air passage is formed between the outer wall of the guide rod (3) and the fine air guide groove (121), and the air passage is connected downward to the inner cavity of the sleeve (5).

3. The novel damping explosion-proof valve according to claim 2, characterized in that: The air guide grooves (121) are distributed along the axial direction, and the fall speed of the guide rod (3) is controlled by controlling the number and / or size and / or area of ​​the air guide grooves (121).

4. The novel damping explosion-proof valve according to claim 1, characterized in that: The gap between the inner wall of the movable hole (12) and the outer wall of the guide rod (3) forms the air passage.

5. A novel damping explosion-proof valve according to claim 1, characterized in that: The air inlet (51) is located at the lower end of the sleeve (5) and below the lower end face of the guide rod (3).

6. The novel damping explosion-proof valve according to claim 1, characterized in that: The guide rod (3) is cylindrical and has a through hole (31) that runs through the upper and lower ends. The inner wall of the upper part of the through hole (31) is provided with an internal thread. The lower end of the upper cover (2) is formed with a threaded section (21) and is fixedly assembled with the internal thread through the threaded section (21). The lower end of the guide rod (3) is formed with an outwardly extending flange (32), which contacts the lower end of the spring (4). Alternatively, the guide rod (3) is integrally connected to the lower end of the upper cover (2) to form an inseparable part, and the lower end of the guide rod (3) is formed with an outwardly extending flange (32), which contacts the lower end of the spring (4).

7. A novel damping explosion-proof valve according to claim 2, characterized in that: The lower end of the valve body (1) is formed with a boss (13), and the upper end of the sleeve (5) is fitted and fixed to the outside of the boss (13) to form a sealed assembly.

8. A novel damping explosion-proof valve according to claim 7, characterized in that: The outer side of the boss (13) is provided with a first annular groove (131), and a first sealing ring (132) is also provided in the first annular groove (131). The inner wall of the upper end of the sleeve (5) contacts the first sealing ring (132) to form a tight sealing assembly.

9. A novel damping explosion-proof valve according to any one of claims 1-8, characterized in that: The one-way sealing assembly (6) includes a fixing member (61) disposed in the sleeve (5), a sealing gasket (62) sleeved on the fixing member (61) and movable up and down relative to the fixing member (61), and a small spring (63) disposed between the fixing member (61) and the sealing gasket (62). The sealing gasket (62) presses against all air inlets (51) under the elastic force of the small spring (63) to seal the air inlets (51).

10. A novel damping explosion-proof valve according to any one of claims 1-8, characterized in that: The one-way sealing assembly (6) includes an umbrella-shaped sealing gasket (64) and a connecting buckle (65) integrally formed on the lower end of the umbrella-shaped sealing gasket (64); the sleeve (5) is provided with a connecting hole (52) on the side of the air inlet (51), and the connecting buckle (65) is snapped and fixed in the connecting hole (52). The outer edge of the umbrella-shaped sealing gasket (64) covers the outside of all air inlets (51) from top to bottom to achieve sealing of the air inlets (51).

Images